In which situation can a mixture always be called a solution?

when one of its components is a gas

when there is no solvent in the mixture

when its components are made up of different types of particles

when the mixture is homogeneous

when the mixture is homogeneous

Explanation:

A homogeneous mixture has a uniform composition whereas a heterogeneous mixture does not. A homogeneous mixture exists in a single phase whereas a heterogeneous mixture has more than one phase. For example, salt and water or salt solution is a homogeneous mixture but gravel and water is a heterogeneous mixture. Thus a homogeneous mixture is called a true solution.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.